Process for producing high RON gasoline using ATS zeolite
AssigneeChevron U.S.A. Inc.
InventorsTheo Maesen, Tom Harris
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Abstract
A process for producing a high RON naphtha which comprises contacting a hydrocarbon feed stream comprising a mixture of the isomers of C5 and C6 paraffins with ATS zeolite, such as SSZ-55, in an adsorption zone, whereby the branched isomers of the C5 and C6 paraffins are preferentially adsorbed by the ATS zeolite as compared to the straight chain isomers, and recovering a naphtha product from the adsorption zone having a higher RON than the hydrocarbon feed stream, also including a hydroisomerization process and a hydrocracking process.
Claims25
A process for producing a high RON naphtha which comprises contacting a hydrocarbon feed stream wherein the adsorption zone is maintained under hydroisomerization conditions and the ATS zeolite also serves as a hydroisomerization catalyst to selectively isomerize pentane to methylbutane and isomerize monomethylpentane and n-hexane to dimethylbutane comprising a mixture of the isomers of C5 and C6 paraffins with ATS zeolite in an adsorption zone, whereby the branched isomers of the C5 and C6 paraffins are preferentially adsorbed by the ATS zeolite as compared to the straight chain isomers, desorbing the branched isomers of the C5 and C6 paraffins from the ATS zeolite, and recovering a naphtha product from the adsorption zone having a higher RON than the hydrocarbon feed stream.
A process for isomerizing a light naphtha feed stream comprising isomers of C5 and C6 paraffins which comprises contacting the light naphtha feed stream with an ATS zeolite in a hydroisomerization zone under hydroisomerization conditions, whereby the isomer methylbutane is preferentially formed as compared to n-pentane and the isomer dimethylbutane is preferentially formed as compared to monomethylpentane and n-hexane, adsorbing the methylbutane and dimethylbutane on the ATS zeolite, and recovering from the hydroisomerization zone by catalytic distillation a naphtha product stream enriched with methylbutane and dimethylbutane.
A process for preparing gasoline having a high RON and low oxygenates which comprises contacting a hydrocarbon feed stream in a hydrocracking zone with a hydrocracking catalyst under hydrocracking conditions, wherein the hydrocracking catalyst comprises an ATS zeolite, an active hydrocracking catalyst, and a hydrogenation component, selectively adsorbing methylbutane and dimethylbutane on the ATS zeolite, desorbing the methylbutane and dimethyl butane from the ATS zeolite, and recovering from the hydrocracking zone a methylbutane and dimethylbutane enriched naphtha product.
Dependencies are inferred from the claim text.